The man gets old, as he has been told. The woman is older still, and though looking so young, She is in pain a lot and knows that.
The man is just an old, silly linguist, not even real Just a computational linguist. The woman is a sexto-grammarian and an expert and teacher, She loves it, and still teaches people everything.
And although their love is unquestionably strong and true, Their time together is all too short, Their all too short "conjugal visits" are More about "conjugation" than anything else.